# File lib/mongo_mapper/plugins/identity_map.rb, line 72
        def load(attrs, with_cast = false)
          return super unless Thread.current[:mongo_mapper_identity_map_enabled]
          return nil unless attrs
          document = get_from_identity_map(attrs['_id'])

          if !document
            document = super
            document.add_to_identity_map
          end

          document
        end